Algodoo

I didn't realize that, but now that I've read up on CVTs, I can see that you are correct.

OK, if you want. You can also copy my code if you desire. The code is in the stretched axle, the brake axle, and the two circles. If you prefer to just make the engine and have me add the motor plot, then we can do that.

Interesting. This brings up some other ideas:

1. Change the Name or Title to "I'm a jerk who stole this from Xray".
2. Automatically quit the application if author doesn't match.
3. Spawn the textbox that says "This scene was stolen from Xray" from another location.
4. Delete every nth object if author doesn't match.
5. For other users: Make an incredibly lame scene and put the "This scene was stolen from Xray" box in it.

Wow. That's good detective work by The Linkage.

Maybe somebody can take this one and add more coverage and throw in some fading. I forget exactly how the movie one went.

This is a great scene. I can see why you would want to copy protect it.

Yes, it's truly amazing how well it works.

Well done. I don't think you can get much closer than that.

See Puzzle2 Hungarian Rings.

This Internal Circle Gear may help. You probably need 15 and 20 tooth gears. Use kilinich's Circle gears generator to make them.

Kilinich circle gears are very precise and will mesh well if used as external gears. Internal circle gears have some interference. The Polygon Box Circle Gears scene shows different ways of handling the interference. You may have to scale the pair of gears, but it should be quick and easy if you scale the pair at the same time and press shift while scaling them.

1. Replace tracer with circle.
2. circle._surface = "";
3. circle.postStep := (e)=>{_surface = _surface + pos + ","};
4. Start scene let motor move 1 revolution.
5. Copy circle, paste into notepad.
6. Make any small polygon.
7. Copy polygon, paste into new notepad.
8. Copy notepad.circle._surface value, paste into notepad.polygon.surfaces.
9. Copy all notepad.polygon.
10. Paste notepad.polygon into Algodoo.
11. Make a box larger than housing cutout.
12. Subtract housing cutout from box.

Turn off the grid and press Shift when scaling. Use 12 and 16 tooth gears.

Xray,

I think you are wrong.

homieeee,

Thanks.

Xray,

Sorry I said you were wrong. I now think you are right and that there is something going on. The left tires are the only ones to track, since I removed the tracking on the right tires in order to avoid overconstraint. It looks like I either have to put the tracking tires in the center and put fake tires on the outside or else design the font suspension so the tires rotate about a common center.

The Linkage,

So circles are stronger than polygons. Make, or point me to, a scene that shows this.

Thanks for the suggestion. I agree with everything you say, but I'm not changing it, because its proportions are similar to my car and trailer. I made this scene after driving to the dump with a small trailer in tow. I always have a difficult time backing up and made the scene to practice.

I concur.

All three sets are viable solutions. The first has the smoothest operation. The third set is easiest to make.

Thanks. I'll keep it in mind next time I have the trailer hooked up.

I didn't realize this until after I made the Circle vs. Polygon scene, but I made a Polygon Box Circle Gears scene that allows you to test the strength of the different gears. Test results indicate that the polygons are stronger than the reduced radius circle gears in this case.

I suspect that we would all agree that, when it comes to using circles vs. circular shaped polygons, circles are the better choice, because they are exact, easy to use, and have a simpler mathematical model. As far as circles being substantially stronger than polygons, I just don't see it.

Jimmyfisherman,
Regarding "Grab the gears with the drag tool and try moving them", that is an uncontrolled test. That is why I used a brake to control the resistance. I can break either set of gears with the drag tool.

Regarding "The collisions on circles are better". What is a "better collision"? Is it stronger, faster, or does it use less resources? Please show me. The circle gears and the polygon gears each have equal amounts of bodies, geometries, narrow collision tests, contacts, and constraints.


The Linkage,
Regarding "You're making oversized gears", I think you are right, but it was unintentional. I scaled them to 1/10th the original size and still don't see any big difference between circles and polygons.

Regarding "the rotor suffers from sudden kicks", it may be that circles tolerate impact better than polygons. I had done some tests with colliding balls but couldn't see any significant difference.

Both,

Regarding tooth strength, I suspect that tooth strength has more to do with object density and area than it has to do with whether it is a circle or polygon.

Regarding gear stability, I suspect gear stability has a lot to do with contact geometry and the number of contacts required to move the gear. In this regard, circles excel because there is only one contact when two circles collide. Polygons can be designed for minimum contacts, but this is not automatically guaranteed like it is for circles.

It would be better to create your own scene rather than copy somebody else's and try to pass it off as your own. This scene looks a lot like TNT simulation. My recommendation would be to delete this scene before you get a bad reputation.

In laser pen:

postStep := (e)=>{
fadeDist == 0 ? {
fadeDist = 10
} : {
fadeDist = 0
}
};

cuts faster

This was made to show a concept and not as a tutorial but here's the general steps.
1. Make a rack.
2. Make a circle that has a perimeter equal to an integral number of gear teeth.
3. Make a device to roll the rack pitch line about the circle perimeter.
4. Make clones of the rack as you roll it around the perimeter.
5. Delete everything except the cloned racks.
6. Merge all the racks together.
7. Trim off the excess to get what looks like an internal gear.
8. Use "internal gear" as a cookie cutter.
9. Add a central hinge.

Show us what you would like to happen with regular gears, then maybe we can make circular gears to replace them.

Regarding "bouncing all over the place" it looks like 7% regulation at 15 RPM and 20% at 300 RPM at 200 Hz and 100 Nm load.

Regarding "use the fewest possible number of teeth", I don't think that matters since fewer teeth don't necessarily reduce the number of collisions. Each gear set her has one or two collisions at any one time; one if a tooth is handling the full load, 2 if it is passing the load off to another tooth.

X-Zibit,

You are right, the top gears are only good up to 300 RPM.

Gent,

I'm hesitant to say. I've been known to "stretch" the truth from time to time.

Thanks.

Ground surface can be concave where it contacts the grinding wheel.